/*
 * Copyright � 2002-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Collections;
using Spring.Util;

namespace Spring.Messaging.Ems.Connections;

/// <summary>
/// Implementation of Spring IExceptionListener interface that supports
/// chaining allowing the addition of multiple ExceptionListener instances in order.
/// </summary>
/// <author>Juergen Hoeller</author>
/// <author>Mark Pollack (.NET)</author>
public class ChainedExceptionListener : IExceptionListener
{
    private ArrayList listeners = new ArrayList(2);

    /// <summary>
    /// Adds the exception listener to the chain
    /// </summary>
    /// <param name="listener">The listener.</param>
    public void AddListener(IExceptionListener listener)
    {
        AssertUtils.ArgumentNotNull(listener, "listener", "ExceptionListener must not be null");
        listeners.Add(listener);
    }

    /// <summary>
    /// Called when an exception occurs in message processing.
    /// </summary>
    /// <param name="exception">The exception.</param>
    public void OnException(EMSException exception)
    {
        foreach (IExceptionListener listener in listeners)
        {
            listener.OnException(exception);
        }
    }

    /// <summary>
    /// Gets the exception listeners as an array.
    /// </summary>
    /// <value>The exception listeners.</value>
    public IExceptionListener[] Listeners
    {
        get
        {
            return (IExceptionListener[]) listeners.ToArray(typeof(IExceptionListener));
        }
    }
}
